Family histories of breast cancer in the general population of women aged 30–50 (n=1 000 000)
| No (%) | No (%) | No (%) | No (%) | |
|---|---|---|---|---|
| Total | 1 000 000 (100.0) | |||
| Affected with breast cancer | 10 166 (1.0) | |||
| Unaffected with breast cancer | 989 834 (99.0) | 989 834 (100.0) | ||
| And no relatives with breast cancer | 643 082 (64.3) | |||
| And at least one relative with breast cancer | 346 752 (34.7) | 346 752 (100.0) | ||
| One 2nd and no 1st degree relatives | 219 634 (22.0) | 219 634 (63.3) | 219 634 (100.0) | |
| Relative was affected before 50 | 62 792 (28.6) | |||
| Relative was affected at or after 50 | 156 842 (71.4) | |||
| Two or more 2nd and no 1st degree relatives | 56 018 (5.6) | 56 018 (16.2) | 56 018 (100.0) | |
| At least one relative was affected before 50 | 32 975 (58.9) | |||
| All relatives were affected at or after 50 | 23 043 (41.1) | |||
| One 1st and none/one 2nd degree relatives | 60 195 (6.0) | 60 195 (17.4) | 60 195 (100.0) | |
| 1st degree relative was affected before 50 | 26 490 (44.0) | |||
| 1st degree relative was affected at or after 50 | 33 705 (56.0) | |||
| One 1st and two or more 2nd degree relatives | 8 212 (0.8) | 8 212 (2.4) | 8 212 (100.0) | |
| 1st degree relative was affected before 50 | 4 180 (50.9) | |||
| 1st degree relative was affected at or after 50 | 4 032 (49.1) | |||
| Two or more 1st degree relatives | 2 693 (0.3) | 2 693 (0.8) | 2 693 (100.0) | |
| At least one 1st degree relative was affected before 50 | 2 568 (95.4) | |||
| All 1st degree relatives were affected at or after 50 | 125 (4.6) |